Laundry bluing.



STATES PATENT OFFICE.

ADRIANNA ST'fi'RCKE, OF OSSINING, YORK.

LAUNDRY BLUING.

i No Drawing.

To all whom it may concern.

Be it known that I, ADRIANNA STfiRcKE, a citizen of the United States,residing 1n Ossining, in the county of Westchester and State of NewYork, have invented certain new and useful Improvements in LaundryBluing, of which the following is a specification.

V This invention relates'to laundry bluing, and aims to provide certainimprovements therein. Various bluings in powdered or solid form are nowin commercial use, but these so far as I am aware are open to theobjection that they' are only partly soluble especiallydncold water, andhence stain ordiscolor the fabrics. Various substances enter into theircomposition which are deleterious to the clothing, which substancesfinally load the fabri'c and cause it to crack or otherwise injure it.Furthermore, if the clothing is left in such bluing solutions itspeedily becomes sour and discolored.

According to the present invention I rovide a bluing in powdered formwhic is practically instantly soluble in water, either hot or cold,which will not discolor the clothing since there is no precipitate orinsoluble sediment, and in which there is no. danger of souring even ifthe clothes are permitted to soak in the bluing solution for anindefinite period.

In proceeding to produce the bluing provided by my invention I takecommercially pure borax, and pulverize the same finely, passing itthrough a screen or screens until the desired fineness is obtained. Inext take commercial style P in the trade, 2'. e., soluble Prussianblue, ferric potassium ferro-v cyanid. This I also grind to a very finepowder. I then mix 1 the two thoroughly,

" preferably in the proportion of about 95 even and, thoroughly mixedproduct isobtained. The bluing is then ready for use,

b and should be added to the water by sifting Specification of LettersPatent.

it in through a sieve-topped can or otherwise.

Soluble Prussian blue is known as style P and is used to some extent'inlarge laundries. In such uses, however, it requires special preparationbecause of the difliculty extremely rapid and no sedimentis observ able.This very deslrableresult 1saccomplished by the admixture of the bluingwith the borax. The latter exerts an action that may be mechanical orchemical or both, which induces a rapid dissolution of the particles ofbluing so that a clear solution is obtained almost instantly. Hence nostreaking. or discoloration of the clothing is possible. Furthermore,all souring of the clothing is avoided. In practice the clothin may bepermitted to soak for a number 0 days and yet it will be found clean andsweet when removed. 4

I prefer to adhere to the percentages given, namely, 95 per cent. ofborax a'nd five per cent. of blue, since these proportions secure themost favorable results. They may, however, be varied from within theinvention.

What I claim is:

A laundry. bluing comprising approximately 95 per cent. of finelypowdered borax mixed with approximately five per cent. of solublePrussian blue.

Patented Mar. 13, 1917. Application filed'June 13, 1918. Serial No.773,520.

signed my name in the scribing witnesses. ADRIANNA sTURoKE.

presence of two sub- Witnesses: EUGENE V. MYERS, FRED WHITE.

